| Southern bristle tyrant | |
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| Conservation status | |
 Near Threatened (IUCN 3.1) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Tyrannidae |
| Genus: | Pogonotriccus |
| Species: | P. eximius |
| Binomial name | |
| Pogonotriccus eximius (Temminck, 1822) | |
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| Synonyms | |
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Phylloscartes eximius | |
The southern bristle tyrant (Pogonotriccus eximius) is a Near Threatened species of passerine bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Brazil, and Paraguay.
Taxonomy and systematics
The southern bristle tyrant was originally described as Pogonotriccus eximius. The genus Pogonotriccus was later merged into genus Phylloscartes. Beginning in 2016 taxonomic systems resurrected Pogonotriccus for this species and a few others.
The southern bristle tyrant is monotypic.
Description
The southern bristle tyrant is about 11 to 11.5 cm (4.3 to 4.5 in) long; one male weighed 7.5 g (0.26 oz). The sexes have the same plumage. Adults have a gray crown and nape with an olive wash in the center of the crown. A wide white streak at the lores narrows and becomes grayer over and past the eye to the nape. Their ear coverts are yellow bisected by a wide black crescent. Their back, rump, and tail are bright olive. Their wings are dusky with yellowish olive edges on the flight feathers and wing coverts. Their chin, throat, and underparts are bright yellow with a light olive wash on the breast. Both sexes have a dark brown or dull red iris, a black maxilla, a pinkish white mandible, and pale gray legs and feet.
Distribution and habitat
The southern bristle tyrant is a bird of the Atlantic Forest. It is found from central Minas Gerais and western Espírito Santo states in Brazil south into northern Rio Grande do Sul and west into eastern Paraguay and extreme northeastern Argentina's Misiones Province. It inhabits the interior and edges of humid forest, especially near watercourses. It tends to frequent the forest's mid-level. Sources differ on its elevational range. The IUCN and van Perlo state an upper limit of 600 m (2,000 ft). The Cornell Lab of Ornithology's Birds of the World places it between about 800 and 1,700 m (2,600 and 5,600 ft) in the northern part of its range and down to 100 m (300 ft) at the far southern edges of it.
Behavior
Movement
The southern bristle tyrant is a year-round resident.
Feeding
The southern bristle tyrant's diet has not been detailed but it is known to feed on arthropods. It typically forages in the forest's mid-story, perching upright and making short upward sallies to snatch or hover-glean prey from vegetation. It is usually seen singly or in pairs and frequently joins mixed-species feeding flocks.
Breeding
The southern bristle tyrant's breeding season has not been fully defined but appears to span at least from July to October. Its nest is a globe with a short entrance tunnel near its top. It is made from live moss held together with spider web, lined with seed floss, and attached to a mossy tree trunk. The clutch is two eggs. The incubation period, time to fledging, and details of parental care are not known.
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Songs and calls Listen to the southern bristle tyrant on xeno-canto |
Vocalization
The southern bristle tyrant's song is an "extr. high, energetic, strident, rattling 'vrrrrrjeh' trill" lasting one or two seconds.
Status
The IUCN has assessed the southern bristle tyrant as Near Threatened. Its population size is not known and is believed to be decreasing. "Agricultural conversion and deforestation for mining and plantation production historically threatened its lowland habitats. Current key threats are urbanisation, industrialisation, agricultural expansion, colonisation and associated road-building." The results of a study published in 2015 "indicated that the Southern Bristle-Tyrant may lose 40% of its potential distribution under scenarios of global warming".
References
- ^ BirdLife International (2016). "Southern Bristle-tyrant Pogonotriccus eximius". IUCN Red List of Threatened Species. 2016: e.T22724696A94876667. doi:10.2305/IUCN.UK.2016-3.RLTS.T22724696A94876667.en. Retrieved 6 December 2024.
- ^ Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2024). "Tyrant flycatchers". IOC World Bird List. v 14.2. Retrieved 19 August 2024.
- Temminck, C. J. (1822). Nouveau recueil de planches coloriées d'oiseaux, pour servir de suite et de complement aux planches enluminées de Buffon, livraison 18, plates 103, 104, livraison 20, plate 115. Available at https://www.biodiversitylibrary.org/item/109469#page/9/mode/1up.
- BirdLife International (2016) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 9. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/BirdLife_Checklist_Version_90.zip .
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2022. The eBird/Clements checklist of birds of the world: v2022. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
- Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 31 May 2023. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved June 1, 2023
- ^ Tonetti, V. R. and M. A. Pizo (2022). Southern Bristle-Tyrant (Pogonotriccus eximius), version 1.1. In Birds of the World (N. D. Sly, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.sobtyr2.01.1 retrieved December 6, 2024
- ^ van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. pp. 298–299. ISBN 978-0-19-530155-7.
- ^ de la Peña, Martín R.; Rumboll, Maurice (2001). Birds of Southern South America and Antarctica. Princeton Illustrated Checklists. New Jersey: Princeton University Press. pp. Plate 72, map 72.11. ISBN 0691090351.
- Tonetti, Vinicius Rodrigues; Gussoni, Carlos O. A.; Pizo, Marco A. (2017). "First egg and standardized nest description of the Southern Bristle-Tyrant (Phylloscartes eximius)". The Wilson Journal of Ornithology. 129 (2): 372–376. doi:10.1676/16-063.1. S2CID 89777639.
- Tonetti, V. R. (2015). Densidade, Seleção de Micro-habitat e Distribuição de Phylloscartes eximius (Aves: Tyrannidae). M.S. thesis, Instituto de Biociências do Campus de Rio Claro, Universidade Estadual Paulista “Júlio de Mesquita Filho”, São Paulo, Brazil.
| Taxon identifiers | |
|---|---|
| Pogonotriccus eximius | |